Pin dictionaries from being deleted while request is outstanding.

net/filter/filter.cc

Index: net/filter/filter.cc
diff --git a/net/filter/filter.cc b/net/filter/filter.cc
index c8a4740a40af3b01479bfba4e76860bc7fdf6e2d..45fda68d7525ffe021c69ae4e91cc0cb8bfaa16d 100644
--- a/net/filter/filter.cc
+++ b/net/filter/filter.cc
@@ -229,7 +229,7 @@ void Filter::FixupEncodingTypes(
   }
 
   // If the request was for SDCH content, then we might need additional fixups.
-  if (!filter_context.SdchResponseExpected()) {
+  if (!filter_context.SdchDictionariesAdvertised()) {
     // It was not an SDCH request, so we'll just record stats.
     if (1 < encoding_types->size()) {
       // Multiple filters were intended to only be used for SDCH (thus far!)